I've not used this app, so apologies if these suggestions have already been incorporated:

Calendar integration - it could be good tobe able to export fixtures to the device's calendar (so you can see what's clashing with the most important games!). I would have thought this would need to be able to select that only certain fixtures get exported or only certain fixtures from those selected get an alarm set. The ways to select would want to be:

Whole tournament
Knockout stages only.
Fixtures in particular group.
Fixtures featuring particular country.